CN213481625U

CN213481625U - Three-line pendulum for accurately measuring rotational inertia of rigid body

Info

Publication number: CN213481625U
Application number: CN202022958208.8U
Authority: CN
Inventors: 韦宁燕; 韦洪浪; 吴明林; 杨达莉
Original assignee: Bowen Collegeof Management Guilin University Of Technology
Current assignee: Bowen Collegeof Management Guilin University Of Technology
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-06-18
Anticipated expiration: 2030-12-09

Abstract

The utility model belongs to the technical field of the physics experimental facilities, concretely relates to three-way pendulum of accurate measurement rigid body inertia, including unable adjustment base, the bracing piece is installed to unable adjustment base's upper end, the reinforcement piece is installed in the left side of bracing piece, the alignment jig is installed to the outer lane of bracing piece, the connection ring is installed to the lower extreme of upper disc, and unable adjustment base is used for fixed and the support to the whole device. Through the installation setting of balancing weight, can increase unable adjustment base's weight, and then improve unable adjustment base's stability to guarantee measured data's accuracy nature. Through the installation setting of bracing piece, can be used for the support to alignment jig and upper end support frame, the reinforcement piece of isosceles right triangle structure has non-deformable's characteristic, and the parallel position all around of installing in the bracing piece bottom of four reinforcement pieces not only can be used for strengthening the stability of bracing piece, can ensure the perpendicular of bracing piece moreover to guarantee measured data's accuracy nature.

Description

Three-line pendulum for accurately measuring rotational inertia of rigid body

Technical Field

The utility model belongs to the technical field of the physics experimental facilities, concretely relates to three-line pendulum of accurate measurement rigid body inertia.

Background

Moment of inertia, which is a measure of the inertia of a rigid body when it rotates about an axis, i.e. the characteristic of a rotating body to maintain its uniform circular motion or rest, is expressed by the letter I or J, and in classical mechanics, moment of inertia is usually expressed by I or J, with SI being in kg · m². The role of moment of inertia in rotational dynamics is equivalent to the mass in linear dynamics and can be formally understood as the inertia of an object to rotational motion for establishing a relationship between several quantities, such as angular momentum, angular velocity, moment and angular acceleration, the magnitude of which depends on the shape of the object, the mass distribution and the position of the rotation axis. The rotational inertia of the rigid body has important physical significance and is an important parameter in the industrial fields of scientific experiments, engineering technology, aerospace, electric power, machinery, instruments and the like. For example, an indicating system of an electromagnetic system meter can be used for measuring a tiny current or electric quantity respectively due to different rotational inertia of coils. It is necessary to accurately measure the moment of inertia in the design of engine blades, flywheels, gyros, and satellites. The moment of inertia is determined only by the shape, mass distribution and position of the rotating shaft of the rigid body, and is independent of the rotating state of the rigid body around the shaft, the moment of inertia of the uniform rigid body with a regular shape can be directly calculated by a formula, and the moment of inertia of the irregular rigid body or the non-uniform rigid body is generally determined by an experimental method, so the experimental method is very important. The existing three-line pendulum for measuring the rotational inertia of the rigid body needs to swing for many times in the measuring process, so that certain shaking influence can be caused on a measuring instrument, and the measuring accuracy is further influenced.

SUMMERY OF THE UTILITY MODEL

To solve the problems set forth in the background art described above. The utility model provides an accurate measurement rigid body inertia's three-wire pendulum is used for fixed and the support to whole device through unable adjustment base, through the installation setting of balancing weight, can increase unable adjustment base's weight, and then improves unable adjustment base's stability to guarantee measured data's accuracy nature. Through the installation setting of bracing piece, can be used for the support to alignment jig and upper end support frame, the reinforcement piece of isosceles right triangle structure has non-deformable's characteristic, and the parallel position all around of installing in the bracing piece bottom of four reinforcement pieces not only can be used for strengthening the stability of bracing piece, can ensure the perpendicular of bracing piece moreover to guarantee measured data's accuracy nature. The inner groove of the upper end support frame is sleeved at the position of the outer ring of the upper end of the support rod, and then the upper end support frame is fixedly connected by screwing the adjusting bolt. The firm piece is used for the enhancement to upper end support frame stability, and the level nature of upper end support frame is improved through the non-deformable's that has characteristic to the firm piece that the triangle-shaped structure set up, and then the characteristics of guarantee measured data's accuracy nature.

In order to achieve the above object, the utility model provides a following technical scheme: a three-line pendulum for accurately measuring rigid body moment of inertia comprises a fixed base, wherein a supporting rod is installed at the upper end of the fixed base, a reinforcing block is installed on the left side of the supporting rod, an adjusting frame is installed on the outer ring of the supporting rod, a photoelectric door is installed on one side of the adjusting frame, a laser emitter is installed on the inner ring of the photoelectric door, a laser receiver is installed on the inner ring of the photoelectric door, an adjusting bolt is installed at the front end of the adjusting frame, an upper end supporting frame is installed at the upper end of the supporting rod, a stabilizing block is installed on the inner ring of the upper end supporting frame, an upper layer disc is installed at the lower end of the upper layer disc, a connecting ring is installed at the lower end of the upper layer disc, a suspension wire is arranged on the inner side of the connecting ring, a lower layer disc is arranged on one side of the suspension wire, a, the outer ring of the solid column is provided with a rotating ring.

Preferably, the fixed base is a square-structure base, is arranged at the lower end of the supporting rod, and is internally provided with a square-structure balancing weight; unable adjustment base is used for fixed and the support to whole device, sets up through the installation of balancing weight, can increase unable adjustment base's weight, and then improves unable adjustment base's stability to guarantee measured data's accuracy nature.

Preferably, the support rod is of a cuboid structure, the cross section of the support rod is square, reinforcing blocks are arranged on the periphery of the outer ring of the bottom end of the support rod, and the reinforcing blocks are of an isosceles right triangle structure; through the installation setting of bracing piece, can be used for the support to alignment jig and upper end support frame, the reinforcement piece of isosceles right triangle structure has non-deformable's characteristic, and the parallel position all around of installing in the bracing piece bottom of four reinforcement pieces not only can be used for strengthening the stability of bracing piece, can ensure the perpendicular of bracing piece moreover to guarantee measured data's accuracy nature.

Preferably, the adjusting frame is of a square structure and is arranged at the left side of the photoelectric door, a square inner groove is reserved in the middle of the adjusting frame, and the size of the inner groove is matched with that of the supporting rod; through rotating adjusting bolt and unscrewing, then use the bracing piece as the center with the alignment jig and carry out vertical direction's upper and lower removal, and then can drive the upper and lower removal of photogate vertical direction, then screw up adjusting bolt and fix the alignment jig to the realization is not only increased the flexibility that measuring instrument used, improves measured data's accuracy moreover to the adjustment of different use heights.

Preferably, an inner groove is formed in the inner side of the lower end of the upper end support frame, and the size of the inner groove is matched with that of the support rod; the inner groove of the upper end support frame is sleeved at the position of the outer ring of the upper end of the support rod, then the upper end support frame is fixedly connected by screwing the adjusting bolt, the stabilizing block is used for enhancing the stability of the upper end support frame, the stabilizing block arranged in the triangular structure improves the levelness of the upper end support frame through the characteristic of having low probability of deformation, and the accuracy of measured data is guaranteed.

Preferably, the number of the connecting circular rings is six, every three connecting circular rings are in a group, one group is parallelly arranged at the lower end of the upper tray, and the other group is parallelly arranged at the upper end of the lower tray; the two ends of one suspension wire are tied to the connecting circular rings which are symmetrical up and down respectively, and after the three suspension wires are tied, the connection between the upper-layer disc and the lower-layer disc is realized.

Preferably, the light holes are circular holes, six in total, and are symmetrically arranged at the inner side of the lower-layer disc by taking the circle center of the lower-layer disc as a symmetrical point; through the setting of light trap, not only can detect whether the lower disc is located the horizontally position, can detect whether the gravity point of lower disc is located the centre of a circle moreover, and then guarantee measured data's accuracy.

Preferably, the swivel is arranged in a circular ring structure, a swivel hole is formed in the center of the inner ring, and the size of the swivel hole is matched with that of the three-dimensional column; the connection coincidence of the swivel and the lower disc is realized by sleeving the swivel hole at the position of the outer ring of the three-dimensional column.

Compared with the prior art, the beneficial effects of the utility model are that: unable adjustment base is used for fixed and the support to whole device, sets up through the installation of balancing weight, can increase unable adjustment base's weight, and then improves unable adjustment base's stability to guarantee measured data's accuracy nature. Through the installation setting of bracing piece, can be used for the support to alignment jig and upper end support frame, the reinforcement piece of isosceles right triangle structure has non-deformable's characteristic, and the parallel position all around of installing in the bracing piece bottom of four reinforcement pieces not only can be used for strengthening the stability of bracing piece, can ensure the perpendicular of bracing piece moreover to guarantee measured data's accuracy nature. Through rotating adjusting bolt and unscrewing, then use the bracing piece as the center with the alignment jig and carry out vertical direction's upper and lower removal, and then can drive the upper and lower removal of photogate vertical direction, then screw up adjusting bolt and fix the alignment jig to the realization is not only increased the flexibility that measuring instrument used, improves measured data's accuracy moreover to the adjustment of different use heights. The inner groove of the upper end support frame is sleeved at the position of the outer ring of the upper end of the support rod, then the upper end support frame is fixedly connected by screwing the adjusting bolt, the stabilizing block is used for enhancing the stability of the upper end support frame, the stabilizing block arranged in the triangular structure improves the levelness of the upper end support frame through the characteristic of having low probability of deformation, and the accuracy of measured data is guaranteed. Through the setting of light trap, not only can detect whether the lower disc is located the horizontally position, can detect whether the gravity point of lower disc is located the centre of a circle moreover, and then guarantee measured data's accuracy.

The parts of the device not involved are the same as or can be implemented using prior art.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic side view of the cross-sectional structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic top view of the support rod of the present invention;

fig. 4 is a perspective structural schematic view of the fixing base of the present invention;

FIG. 5 is a schematic structural view of a connection ring of the present invention;

FIG. 6 is a schematic top view of the lower tray of the present invention;

fig. 7 is a schematic top view of the swivel of the present invention;

in the figure: 1. a fixed base; 2. a balancing weight; 3. a support bar; 4. a reinforcing block; 5. an adjusting bracket; 6. a photogate; 7. a laser transmitter; 8. a laser receiver; 9. adjusting the bolt; 10. an upper end support frame; 11. a stabilizing block; 12. an upper tray; 13. connecting the circular rings; 14. a suspension wire; 15. a lower tray; 16. a solid column; 17. a light-transmitting hole; 18. rotating the ring; 19. and (4) rotating a ring hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-7, the present invention provides the following technical solutions: a three-line pendulum for accurately measuring rigid body moment of inertia comprises a fixed base 1, wherein a support rod 3 is installed at the upper end of the fixed base 1, a reinforcing block 4 is installed on the left side of the support rod 3, an adjusting frame 5 is installed on the outer ring of the support rod 3, a photoelectric door 6 is installed on one side of the adjusting frame 5, a laser emitter 7 is installed on the inner ring of the photoelectric door 6, a laser receiver 8 is installed on the inner ring of the photoelectric door 6, an adjusting bolt 9 is installed at the front end of the adjusting frame 5, an upper end support frame 10 is installed at the upper end of the support rod 3, a stabilizing block 11 is installed on the inner ring of the upper end support frame 10, an upper disc 12 is installed at the lower end of the upper disc 10, a connecting circular ring 13 is installed at the lower end of the upper disc 12, a suspension line 14 is arranged on the inner side of the connecting circular, the upper end of the lower layer disc 15 is provided with a solid column 16, the inner side of the lower layer disc 15 is provided with a light hole 17, and the outer ring of the solid column 16 is provided with a rotating ring 18.

Specifically, the fixed base 1 is a square-structure base, is mounted at the lower end of the support rod 3, and is internally provided with a square-structure counterweight block 2; unable adjustment base 1 is used for fixed and the support to whole device, through the installation setting of balancing weight 2, can increase unable adjustment base 1's weight, and then improves unable adjustment base 1's stability to guarantee measured data's accuracy nature.

Specifically, the support rod 3 is of a cuboid structure, the cross section of the support rod is square, reinforcing blocks 4 are mounted on the periphery of the outer ring of the bottom end of the support rod 3, and the reinforcing blocks 4 are of an isosceles right triangle structure; through bracing piece 3's installation setting, can be used for the support to alignment jig 5 and upper end support frame 10, the reinforcement piece 4 of isosceles right triangle structure has non-deformable's characteristic, and four parallel the installing in the position all around of bracing piece 3 bottom of reinforcement piece 4 not only can be used for strengthening bracing piece 3's stability, can ensure bracing piece 3's perpendicular moreover to guarantee measured data's accuracy nature.

Specifically, the adjusting frame 5 is of a square structure and is arranged at the left side of the photoelectric door 6, a square inner groove is reserved in the middle, and the size of the inner groove is matched with that of the supporting rod 3; through rotating adjusting bolt 9 and unscrewing, then use bracing piece 3 as the center with alignment jig 5 and carry out vertical direction's upper and lower removal, and then can drive the upper and lower removal of 6 vertical directions of photoelectricity door, then screw up adjusting bolt 9 and fix alignment jig 5 to the realization is to the adjustment of different use heights, not only increases the flexibility that the measuring instrument used, improves measured data's accuracy moreover.

Specifically, an inner groove is arranged on the inner side of the lower end of the upper end support frame 10, and the size of the inner groove is matched with that of the support rod 3; through the position of the inner groove cover with upper end support frame 10 at 3 upper ends outer lanes of bracing piece, then with screwing up adjusting bolt 9, the realization is fixed the connection of upper end support frame 10, and stabilizing block 11 is used for the enhancement to upper end support frame 10 stability, and stabilizing block 11 that the triangle-shaped structure set up improves the horizontality of upper end support frame 10 through the non-deformable's that has characteristic, and then ensures measured data's accuracy nature.

Specifically, the connecting rings 13 are six in number, each three of the connecting rings are in a group, one group is parallelly arranged at the lower end of the upper tray 12, and the other group is parallelly arranged at the upper end of the lower tray 15; by tying both ends of one suspension wire 14 to the vertically symmetrical connection rings 13, respectively, the connection between the upper tray 12 and the lower tray 15 is achieved after three suspension wires 14 are tied.

Specifically, the light holes 17 are circular holes, six in total, and are symmetrically arranged at positions on the inner side of the lower-layer disc 15 by taking the circle center of the lower-layer disc 15 as a symmetric point; through the setting of light trap 17, not only can detect whether lower floor's dish 15 is located the horizontally position, can detect whether the gravity point of lower floor's dish 15 is located the centre of a circle moreover, and then guarantee measured data's accuracy.

Specifically, the swivel 18 is arranged in a circular ring structure, a swivel hole 19 is arranged at the central position of the inner ring, and the size of the swivel hole 19 is matched with that of the three-dimensional column 16; the connection coincidence of the rotating ring 18 and the lower disc 15 is realized by sleeving the rotating ring hole 19 at the position of the outer ring of the solid column 16.

The working principle and the using process of the invention are as follows: when in use, the inner groove of the upper end support frame 10 is sleeved on the position of the outer ring of the upper end of the support rod 3, then the adjusting bolt 9 is screwed, the connection and fixation of the upper end support frame 10 are realized, the stabilizing block 11 is used for reinforcing the stability of the upper end support frame 10, the horizontality of the upper end support frame 10 is improved by the non-deformable characteristic of the stabilizing block 11 arranged in a triangular structure, further the accuracy of measured data is ensured, then the two ends of one suspension wire 14 are respectively tied on the upper and lower symmetrical connecting circular rings 13, after the three suspension wires 14 are tied, the connection of the upper layer disc 12 and the lower layer disc 15 is realized, then the adjusting bolt 9 is rotated and unscrewed, then the adjusting frame 5 is moved up and down in the vertical direction by taking the support rod 3 as the center, further the up and down movement in the vertical direction of the photoelectric door 6 can be driven, then the adjusting bolt 9 is screwed to fix the adjusting frame 5, thereby realizing the adjustment to different use heights, not only increasing the flexibility of the measuring instrument, but also improving the accuracy of the measured data, then realizing the connection coincidence of the swivel 18 and the lower disc 15 by sleeving the swivel hole 19 at the outer ring position of the three-dimensional column 16, not only detecting whether the lower disc 15 is positioned at the horizontal position, but also detecting whether the gravity point of the lower disc 15 is positioned at the center of a circle by the arrangement of the light hole 17, further ensuring the accuracy of the measured data, being used for supporting the adjusting bracket 5 and the upper end supporting bracket 10 by the installation arrangement of the supporting rod 3, the reinforcing block 4 with the isosceles right triangle structure has the characteristic of difficult deformation, the four reinforcing blocks 4 are parallelly arranged at the periphery of the bottom end of the supporting rod 3, not only being used for strengthening the stability of the supporting rod 3, but also ensuring the verticality of the supporting rod 3, thereby ensuring the accuracy of the measured data, unable adjustment base 1 is used for fixed and the support to whole device, through the installation setting of balancing weight 2, can increase unable adjustment base 1's weight, and then improves unable adjustment base 1's stability to guarantee measured data's accuracy nature.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a three-wire pendulum of accurate measurement rigid body inertia which characterized in that: the device comprises a fixed base (1), a supporting rod (3) is installed at the upper end of the fixed base (1), a reinforcing block (4) is installed on the left side of the supporting rod (3), an adjusting frame (5) is installed on the outer ring of the supporting rod (3), a photoelectric door (6) is installed on one side of the adjusting frame (5), a laser emitter (7) is installed on the inner ring of the photoelectric door (6), a laser receiver (8) is installed on the inner ring of the photoelectric door (6), an adjusting bolt (9) is installed at the front end of the adjusting frame (5), an upper end supporting frame (10) is installed at the upper end of the supporting rod (3), a stabilizing block (11) is installed on the inner ring of the upper end supporting frame (10), an upper disc (12) is installed at the lower end of the upper end supporting frame (10), a connecting circular ring (13) is installed at the lower end of the upper disc (12), and a suspension, one side of suspension wire (14) is provided with lower disc (15), the upper end of lower disc (15) is provided with three-dimensional column (16), the inboard of lower disc (15) is provided with light trap (17), the outer lane of three-dimensional column (16) is provided with swivel (18).

2. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the fixed base (1) is a square structure base, is arranged at the lower end of the support rod (3), and is internally provided with a balancing weight (2) with a square structure.

3. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the support rod (3) is of a cuboid structure, the cross section of the support rod is square, reinforcing blocks (4) are installed on the periphery of the outer ring of the bottom end of the support rod (3), and the reinforcing blocks (4) are of isosceles right triangle structures.

4. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the adjusting frame (5) is of a square structure and is arranged at the left side of the photoelectric door (6), a square inner groove is reserved in the middle, and the size of the inner groove is matched with that of the supporting rod (3).

5. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: an inner groove is formed in the inner side of the lower end of the upper end support frame (10), and the size of the inner groove is matched with that of the support rod (3).

6. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the connecting circular rings (13) are six in total, three are in a group, one group is parallelly arranged at the lower end of the upper-layer disc (12), and the other group is parallelly arranged at the upper end of the lower-layer disc (15).

7. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the light holes (17) are six circular holes, and are symmetrically arranged at the inner side of the lower-layer disc (15) by taking the circle center of the lower-layer disc (15) as a symmetrical point.

8. The three-wire pendulum for accurately measuring the moment of inertia of a rigid body according to claim 1, wherein: the rotating ring (18) is arranged in a circular ring structure, a rotating ring hole (19) is formed in the center of the inner ring, and the size of the rotating ring hole (19) is matched with that of the three-dimensional column (16).